You're welcome Brina - I agree with you, I'm not much of a fan either, but it has its place, just won't always choose it as a first option.

Shweta - not sure you're going to find details, of the sort you require, online - the link goes a long way in explaining how the modalities can be used and assumes it to be the responsibility of the therapist to apply the knowledge to the specific condition or injury?!?!
Are there any specific conditions that you wish to treat with US or TENS that we can help you out with?
Failing that I guess a textbook with case studies in would be your best bet - but know of none of the top of my head!